Measurements of CP Asymmetries in the Decay B --> Phi K

2004/08/16 by The BABAR Collaboration, B. Aubert, Aubert, B.
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0408072

16 pages, 5 postscript figues, submitted to ICHEP2004

arxiv created 2004/08/16 · arxiv updated 2009/12/01

Abstract

We present a preliminary measurement of the time-dependent CP asymmetry for the neutral B-meson decay B⁰→ϕK⁰. We use a sample of approximately 227 million B-meson pairs recorded at the Υ(4S) resonance with the BaBar detector at the PeP-II B-meson Factory at SLAC. We reconstruct the CP eigenstates ϕK⁰_S and ϕK⁰_L where ϕ→ K⁺K^-, K⁰_S→π⁺π^-, and K⁰_L is observed via its hadronic interactions. The other B meson in the event is tagged as either a B⁰ or B⁰ from its decay products. The values of the CP-violation parameters derived from the combined ϕK⁰ dataset are S_ϕK = +0.50± 0.25 (\small stat)^+0.07_-0.04 (\small syst) and C_ϕK = 0.00± 0.23 (\small stat) ± 0.05 (\small syst). In addition, we measure the CP -violating charge asymmetry \mathcalA_CP (B⁺→ ϕK⁺) = 0.054± 0.056 (\small stat) ± 0.012 (\small syst). All results are preliminary.

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